This video delves into the Grant Hammond .45 ACP pistol, a design that arrived too late for the major 1907 US military trials but was nonetheless presented to the military for consideration. While Hammond's earlier designs were complex, the .45 ACP version featured a simplified short-recoil mechanism with a vertically-sliding locking block. Prototypes even had an automatic magazine ejection feature when empty, though this was later removed. Despite undergoing military testing in 1917-1918 and proving accurate, the pistol was ultimately deemed not durable or reliable enough for further adoption. The description also references another of Hammond's prototype pistols with a hybrid blow-forward and long recoil operation in .32 ACP.
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